Tobii may not be a household brand name yet, but that doesn't make the company's eye-tracking technology any less impressive. At last year's CES we got an opportunity to preview Gaze UI, an interface that allowed us to navigate, zoom, select and scroll on a proprietary Windows 8-enabled laptop with just our pupils and a touchpad; this year, Tobii is introducing the REX, a USB-connected peripheral that adds these features to any Windows 8 PC. The device, slightly larger than a pen, adheres to the base of any PC monitor and can be integra
